The Cincinnati Red Stockings scored their most runs in a game versus the Pittsburgh Alleghenys on September 12, 1883, with 27 runs.

Interpreted as:

reds most runs in a regular-season game vs pirates

	TEAM	R	DATE	TM		OPP	RESULT	AB	H	2B	3B	HR	RBI	BB	HBP	SO	SB	CS	PA	TB	XBH	SH	SF	IBB	GIDP	AVG	OBP	SLG	OPS
1	Red Stockings	27	9/12/1883	CIN	vs	PIT	W 27-5
2	Reds	23	8/7/1890	CIN	vs	PTN	W 23-17
3	Red Stockings	21	6/24/1882	CIN	vs	PIT	W 21-4
4	Reds	19	8/25/1995	CIN	@	PIT	W 19-3	47	19	6	1	3	19	4	2	5	0	0	53	36	10	0	0	0	0	.404	.472	.766	1.238
5	Reds	19	4/28/1994	CIN	@	PIT	W 19-7	41	16	4	0	4	18	10	0	9	2	1	51	32	8	0	0	0	1	.390	.510	.780	1.290
6	Redlegs	19	7/14/1955	CIN	@	PIT	W 19-1	47	21	1	1	3	19	12	1	3	1	0	61	33	5	1	0	1	0	.447	.567	.702	1.269
7	Reds	19	4/27/1900	CIN	@	PIT	W 19-5
8	Red Stockings	19	5/4/1882	CIN	vs	PIT	W 19-10
9	Reds	18	4/19/1904	CIN	vs	PIT	W 18-4	38	19	5	2	2	16	5	1	1	0		48	34	9	4				.500	.568	.895	1.463
10	Reds	17	5/7/1894	CIN	@	PIT	W 17-6
11	Redlegs	16	7/29/1955	CIN	vs	PIT	W 16-5	45	22	1	0	5	16	3	1	7	2	0	50	38	6	1	0	0	0	.489	.531	.844	1.375
12	Reds	16	6/27/1926	CIN	vs	PIT	W 16-0	39	18	5	5	1	15	5	0	1	0	0	48	36	11	4				.462	.523	.923	1.446
13	Reds	16	4/29/1926	CIN	@	PIT	W 16-9	41	17	4	0	0	15	9	0	1	0	0	52	21	4	2				.415	.520	.512	1.032
14	Reds	16	8/6/1890	CIN	vs	PTN	W 16-3
15	Reds	15	7/30/2015	CIN	vs	PIT	W 15-5	43	19	3	0	3	15	6	2	6	4	0	52	31	6	0	1	0	0	.442	.519	.721	1.240
16	Reds	15	9/12/1967	CIN	vs	PIT	W 15-7	47	23	4	1	2	15	3	0	4	0	1	50	35	7	0	0	1	0	.489	.520	.745	1.265
17	Reds	15	6/27/1953	CIN	vs	PIT	W 15-5	40	16	1	1	1	15	5	0	2	0	0	45	22	3	0		2	0	.400	.467	.550	1.017
18	Reds	15	6/6/1953	CIN	@	PIT	W 15-7	37	14	0	4	2	15	5	0	4	0	0	44	28	6	2		0	2	.378	.452	.757	1.209
19	Reds	15	9/27/1941	CIN	@	PIT	W 15-9	39	13	1	1	0	14	8	0	3	2	0	48	16	2	1			2	.333	.447	.410	.857
20	Reds	15	5/9/1903	CIN	@	PIT	W 15-8	42	18	2	3	0	-9	4	1	4	0	-9	49	26	5	2		-9	-9	.429	.489	.619	1.108
21	Reds	14	5/10/2021	CIN	@	PIT	W 14-1	39	15	6	0	2	14	5	1	8	1	0	45	27	8	0	0	0	3	.385	.467	.692	1.159
22	Reds	14	4/6/2021	CIN	vs	PIT	W 14-1	39	17	2	1	2	14	3	0	8	0	0	43	27	5	0	1	0	1	.436	.465	.692	1.157
23	Reds	14	8/19/2006	CIN	vs	PIT	W 14-7	36	16	5	0	2	13	3	0	8	2	1	39	27	7	0	0	2	1	.444	.487	.750	1.237
24	Reds	14	9/24/2004	CIN	@	PIT	W 14-8	41	17	3	0	2	13	6	1	11	0	0	48	26	5	0	0	1	3	.415	.500	.634	1.134
25	Reds	14	4/29/1950	CIN	vs	PIT	W 14-6	42	17	5	0	2	14	7	0	5	2	0	49	28	7	0		2	0	.405	.490	.667	1.156